Die for shaping arch-bars



(No Model.)

M. KENNEDY.

DIE FOR SHAPING ARCH BARS.

No. 360,099. Patented Mar. 29, 1887.

n. PETERS. Phummhognpiwr. Wmhinglon, n. c.

NITED STATES Fries.

PATENT MARTIN KENNEDY, OF HEGEWVISCH, ILLINOIS.

SPECIFICATION forming part of Letters Patent No. 360,099. dated March 29, 1887.

Application filed August 2, 1886.

To all whom it may concern:

Be it known that I, IVIARTIN KENNEDY, of Hegewisch, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Dies Specially Intended for Shaping Arch-Bars,of which the following is a specification.

It has been customary to bend arch-bars,in common with other like shapes, between dies whose faces were counterparts of each other and of the shape desired to be produced. W'here, however, accuracy of fitting between the shapes so produced is necessary-as, for example, between arch-bars-it has heretofore been necessary to further shape or straighten the bar which has been subjected to the dies by hand. The necessity for this hand-labor arises from the fact that the shape of the archbar when cooled is not the counterpart of the shape of the diefaces. This variance within practical limits is obviated by dies constructed as hereinafter described.

Another feature of my invention is that,in order to prevent the warping of the dies by overheating, and for the further purpose of increasing their durability, I have provided my improved dies with cavities a a for hold ing water.

In the drawings, A and E, Figure 1,1'epresentapair of arch-bar dies, as seen from above, constructed in accordance with my invention. Fig. 2 shows a pair of arch-bars placed together, as when in use in a car-truck.

It will be seen, by reference to Fig. 2, that the extremities of the finished arch-bar must lie in the same straight line; also, that it is important that the middle portiomg 7:,shall be straight.

Serial No. 209,771. (No model.)

The straight reference-lines a I), c d, and e f, Fig. 1, show plainly the modification made in the shape of the dies, which results in the production of the arch-bars shown in Fig. 2.

The distance between the points jj of the die A and the straightline c d, passing through the ends of the die-face,is about one-eighth of an inch. The angles Z l of the die B are the same distance from the line cf,passing through the extremities of its face. The distance of the middle point, 7c, of the face of die A from the straight line ab is aboutthreesixteenths of an inch. The middle face of die A may be cut away at K, as indicated by dotted lines, leaving four or five inches at each end ofsaid face. The figures given are for an arch-bar of ordinary dimensions, and will'be subject to variation; but such variation will be simply of amount,and may be easily determined for any particular case.

The essential features of my improvement are that the extreme faces of the dies shall incline at their outer ends toward the stationary dieone-eighth ofan inch (moreorless) and that the middle face of the moving die shall be broken-that is,that between the middle faces of the. dies there shall be space and opportunity for contraction, expansion, or displacement of the metal of the bar or blank.

I claim- The bending-dies AB, having their extreme faces inclined and their middle faces forming a brokenline, substantiallyas and for thepurpose specified' MARTIN KENNEDY. \Vitnesses:

I. II. T. MAsoN, J. I. VEEDER. 

